Variable geometry manned orbital vehicle Patent

Variable geometry manned orbital vehicle having high aerodynamic efficiency over wide speed range and incorporating auxiliary pivotal wing

Use of lightweight composites for GAS payload structures

A key element in the design of a small self-contained payload is the supporting structure. This structure must support the experiments and other components while using as little space and weight as possible. Hence, the structure material must have characteristics of being both strong and light. Aluminum was used for the structure on the first Purdue University payload, but consumed a relatively large percentage of the total payload weight. The current payload has a larger power supply requirement than did the previous payload. To allow additional weight for the batteries, a composite material has been chosen for the structure which has the required strength while being considerably lighter than aluminum. A radial fin design has been chosen for ease of composite material lay-up and its overall strength of design. A composite plate will connect the free ends of the fins and add strength and reduce vibration. The physical characteristics of the composite material and the method of open lay-up construction is described. Also discussed are the testing, modifications, and problems encountered during assembly of the experiments to the structure

A study of the local pressure field in turbulent shear flow and its relation to aerodynamic noise generation Semiannual status report, 1 Aug. 1970 - 31 Jan. 1971

Relation of Eulerian and Lagrangian structure of pseudosound pressure and velocity fields in turbulent shear flow to aerodynamic noise generatio

The Chamber Chorale

Program listing performers and works performed

Photon induced secondary electron emission

Numerical models for predicting photon-induced secondary electron emission are presented. The results are compared with experimental measurements made using a Co-60 gamma ray source

Linguistic penetration at Schneider’s Phase 4: Acceptability ratings of entrenched features of Black South African English by South Africans outside the originating culture of the variety

This study has its theoretical roots at the juncture between World Englishes theory, Black South African English (BSAE) as a variety of English, and pedagogy. The study determined acceptability ratings (AR) of selected, entrenched features of BSAE by L1 English and Afrikaans-speaking South African education students in their third year of university. Tolerance for features of BSAE in formal, academic writing suggests that a wider acceptance of BSAE is emerging. I argue that even a low level of acceptance of features of BSAE by this sample group can suggest linguistic convergence and initial entry into Phase 4 of Schneider’s (2009) Dynamic Model of Postcolonial Englishes. This is indicative of a wider acceptance of features of BSAE beyond the originating members of the variety.The study evaluates responses by L1 English and Afrikaans-speaking student teachers at a tertiary institution in Gautengii to a questionnaire based on a list of characteristic features of Black South African English (BSAE) adapted from De Klerk and Gough (2002:362). Students were required to indicate the statements they would mark as incorrect in formal, academic writing and to identify the single feature which they regarded as the most in need of remediation. The findings indicate (up to 26%) that students outside the racial category of ‘black’ are tolerant of certain entrenched features (extension of progressive, no singular or third person indicative present, phrases such as ‘X’s first time’ and omission of the article) of BSAE. This suggests that the variety is gaining momentum as certain features are beginning to be tolerated even in formal, written,  academic contexts at university level. If features are penetrating segments of the South African population outside of the originating culture it can be argued that there is some movement of the variety towards Schneider’s Phase 4 of endonormative standardization of BSAE. However, other entrenched features of BSAE (the use of too and very much as intensifiers, the use of resumptive pronouns and gender conflation in pronouns) received a 0% AR. The pedagogic implications of this non-acceptance are discussed.Key words: acceptability ratings, South Africans, BSAE, World Englishes, Assessment, Schneider, Dynamic model, South Afric

Aligned assessment in support of high-level learning: A critical appraisal of an assignment for a distance-teaching context

This paper takes the form of a critical appraisal of a formative assessment task given to students in an entry-level English for Specific Purposes (ESP) course in an Open and Distance Learning (ODL) context at the University of South Africa (UNISA). The article describes a specific formative assessment task in an ODL learning context and touches on issues of self-regulated learning and appropriation of student writing. Biggs’ theory of constructive alignment, which underpins the assignment, requires an evaluation of the degree to which students construct meaning from learning tasks and the extent to which the assessment is synchronised with learning outcomes and learning activities of the course. The assignment described in this article was an outcome of doctoral research (Spencer 1999) which proved empirically the value of requiring both revision and self-assessment in a writing assignment in a distance-teaching context. These statistically significant findings provided empirical support for self-regulated learning and prompted the design of the assignment described in this article.Keywords: assessment, Biggs’ constructive alignment, formative assessment, assessment criteria, writing research, appropriation, OD

I Met My Love \u27Mid The Roses

https://digitalcommons.library.umaine.edu/mmb-vp/5565/thumbnail.jp

Comparison of Space Shuttle Orbiter low-speed static stability and control derivatives obtained from wind-tunnel and approach and landing flight tests

Tests were conducted in the 8 foot transonic pressure tunnel to obtain wind tunnel data for comparison with static stability and control parameters measured on the space shuttle orbiter approach and landing flight tests. The longitudinal stability, elevon effectiveness, lateral directional stability, and aileron effectiveness derivatives were determined from the wind tunnel data and compared with the flight test results. The comparison covers a range of angles of attack from approximately 2 deg to 10 deg at subsonic Mach numbers of 0.41 to 0.56. In general the wind tunnel results agreed well with the flight test results, indicating the wind tunnel data is applicable to the design of entry vehicles for subsonic speeds over the angle of attack range studied